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Page 3 of 12
AMG3788ERN-DR-1550-
HP Instruction Sheet
D16678-00
Introduction
Unit Functional Schematic
The
AMG3788ERN-DR-1550-HP
receives
optical signals from both primary and
secondary optical channels. The primary
and secondary channels operate at the
same wavelength (1550nm) and are
transmitted on separate optical fibres.
The
AMG3788ERN-DR-1550-HP
drops off
up to 8 video signals and the data signals
transmitted from
AMG3787ER-n-DR-1550-
HP
insert units. It also transmits the data
signals back to the insert units.
In normal operation, where connection of both the previous unit and the subsequent unit are OK, the
video and data signal is taken from the primary input and the data transmitted out on the primary
output. The secondary optical input is independent and is regenerated on the secondary output.
If the primary input signal is not present, the unit will shut down the secondary output to inform the
previous unit that the signal route is not OK. The previous unit will then send out the video and data
signals on its secondary output in the opposite direction. This signal will be repeated around the ring to
get back to this
AMG3788ERN-DR-1550-HP
on the secondary route. As the primary input is not
present on this unit, the data signal will now be taken from the secondary optical input, thus
maintaining integrity of the data transmission.
If the secondary input signal is not present, the unit will assume that the route to the next unit is not
OK and send out the video and data signal on the secondary optical output. This video and data will
be transmitted to the next unit around the ring in the opposite direction on the secondary route.
Optical System Connection
The
AMG3787ERN-DR-1550-HP
units are designed to be connected in a ring or point to point system.
In a ring system
AMG3787E-1-DR-1550-HP
,
AMG3787E-2-DR-1550-HP
and
AMG3787E-4-DR-1550-
HP
, single, dual and four channel insert units respectively can be combined to make up an 8 channel
video transmission system as illustrated below with an
AMG3788ERN-DR-1550-HP
receiver.
As each unit regenerates the optical signal, the optical dynamic range between each optically
connected node is 22dB.
3788ERN-DR-1550-HP
3700 optics (Primary)
1550nm
TX
RX
3700 optics (Secondary)
1550nm
RX
TX
1550nm
1550nm
8 Video Ouputs
Data/Ethernet I/O
Primary Signal Direction
Secondary Signal Direction
1550nm
1550nm
Secondary Signal Direction
From Primary output and
secondary input of previous
3787-1,2,4-DR -1550-HP
Primary Signal Direction
Opto out
Opto out
Opto in
Opto in
Primary
Secondary
Primary
To Primary input and
secondary output of next
3787-1,2,4-DR-1550-HP
AMG
2783-4
4 CHANNEL VIDEO
INSERT
+
BI-D IRECTIONAL
DAT A
TX
O O
RX
OPTO SYNC
FRONT PANEL INDIC ATORS
VIDEO PRESENT
CH1
O O
CH2
CH3
O O
CH4
POW ER
O
GND
+12-16 Volts dc
O PT O
IN
VIDEO C H 1
VIDEO CH 2
VIDEO C H 3
VIDEO CH 4
OPTOO UT
G ND
O UT -
O UT +
IN-
IN+
DAT A
CONNECT IONS
INT ERNAL
RS422 /485
SW ITCHABL E
*
TX
O O
RX
DATA PRESENT
AMG
2783-2
2 CHANNEL VIDEO
INSERT
+
BI- DIRECTIONAL
DATA
TX
O O
RX
OPT O SYNC
FRO NT PANEL INDIC ATORS
VIDEO PRESENT
CH1
O O
CH2
CH3
O O
CH4
POWER
O
G ND
+ 12-16 Volts dc
OPTO IN
VIDEO C H 1
VIDEO CH 2
VIDEO C H 3
VIDEO CH 4
OPTO OUT
GND
OUT -
OUT +
IN-
IN+
DATA
CO NNECT IONS
INTERNAL
RS422 /48 5
SW ITCHABLE
*
TX
O O
RX
DATA PRESENT
AMG
2783-1
1 CHANNEL VIDEO
INSERT
+
BI- DIRECTIONAL
DATA
TX
O O
R X
OPT O SYNC
FRO NT PANEL INDIC ATORS
VIDEO PRESENT
CH1
O O
CH2
CH
3
O O
CH4
POWER
O
G ND
+ 12-16 Volts dc
OPTOIN
VIDEO C H 1
VIDEO CH 2
VIDEO C H 3
VIDEO CH 4
OPTOOUT
GND
OUT -
OUT +
IN-
IN+
DATA
CO NNECT IONS
INTERNAL
RS422 /48 5
SW ITCHABLE
*
TX
O O
R X
DATA PRESENT
AMG
2783-1
1 CHANNEL VIDEO
INSERT
+
BI- DIRECTIONAL
DATA
TX
O O
R X
OPT O SYNC
FRO NT PANEL INDIC ATORS
VIDEO PRESENT
CH1
O O
CH2
CH
3
O O
CH4
POWER
O
G ND
+ 12-16 Volts dc
OPTO IN
VIDEO C H 1
VIDEO CH 2
VIDEO C H 3
VIDEO CH 4
OPTO OUT
GND
OUT -
OUT +
IN-
IN+
DATA
CO NNECT IONS
INTERNAL
RS422 /48 5
SW ITCHABLE
*
TX
O O
R X
DATA PRESENT
1
3
8
2
1
6
8
3
2
4
7
5
Primary Optical Route
Secondary Optical Route
Two Separate Optical Fibres
